From 0fe48c879f7fbb70a6d047bc6bc2a21d5f252c18 Mon Sep 17 00:00:00 2001
From: Andreas Fankhauser hiddenalpha.ch
Date: Sat, 28 Mar 2026 19:39:52 +0100
Subject: Extend `Logger` API a bit.

- Introduce `isXxxOn()` funcs to check if log level is on.
- Introduce `Qntan_Logger_xxxx()` macros for better overall API
  consistency through the library.
---
 include/qntan/Qntan.h | 52 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/include/qntan/Qntan.h b/include/qntan/Qntan.h
index 580b280..9232817 100644
--- a/include/qntan/Qntan.h
+++ b/include/qntan/Qntan.h
@@ -271,12 +271,52 @@ struct Qntan_Scheduler {
 
 
 
+#ifndef Qntan_Logger_fatal
+#	define Qntan_Logger_fatal(A, ...) do{if(A){(*(A))->fatal(A, __VA_ARGS__);}}while(0)
+#endif
+#ifndef Qntan_Logger_error
+#	define Qntan_Logger_error(A, ...) do{if(A){(*(A))->error(A, __VA_ARGS__);}}while(0)
+#endif
+#ifndef Qntan_Logger_warn
+#	define Qntan_Logger_warn(A, ...)  do{if(A){(*(A))->warn(A, __VA_ARGS__);}}while(0)
+#endif
+#ifndef Qntan_Logger_info
+#	define Qntan_Logger_info(A, ...)  do{if(A){(*(A))->info(A, __VA_ARGS__);}}while(0)
+#endif
+#ifndef Qntan_Logger_debug
+#	define Qntan_Logger_debug(A, ...) do{if(A){(*(A))->debug(A, __VA_ARGS__);}}while(0)
+#endif
+#ifndef Qntan_Logger_trace
+#	define Qntan_Logger_trace(A, ...) do{if(A){(*(A))->trace(A, __VA_ARGS__);}}while(0)
+#endif
+#ifndef Qntan_Logger_isFatalOn
+#	define Qntan_Logger_isFatalOn(A) ((A) && (*(A))->isFatalOn(A))
+#endif
+#ifndef Qntan_Logger_isErrorOn
+#	define Qntan_Logger_isErrorOn(A) ((A) && (*(A))->isErrorOn(A))
+#endif
+#ifndef Qntan_Logger_isWarnOn
+#	define Qntan_Logger_isWarnOn(A) ((A) && (*(A))->isWarnOn(A))
+#endif
+#ifndef Qntan_Logger_isInfoOn
+#	define Qntan_Logger_isInfoOn(A) ((A) && (*(A))->isInfoOn(A))
+#endif
+#ifndef Qntan_Logger_isDebugOn
+#	define Qntan_Logger_isDebugOn(A) ((A) && (*(A))->isDebugOn(A))
+#endif
+#ifndef Qntan_Logger_isTraceOn
+#	define Qntan_Logger_isTraceOn(A) ((A) && (*(A))->isTraceOn(A))
+#endif
+
 struct Qntan_Logger {
 	/* Logger impls MUST prefer format specifiers that are specified in
 	 * POSIX stdio printf family of functions.
 	 * Logger impls SHOULD NOT implement format specifiers that could be
 	 * confused by standard specifiers specified by stdio printf and
 	 * related APIs.
+	 * This API also got inspiration from "http://slf4j.org/". So you
+	 * might find useful documentation there, even slf4j is made for
+	 * Java.
 	 */
 	void (*fatal)( struct Qntan_Logger**, char const*fmt, ...);
 	/**/
@@ -290,6 +330,18 @@ struct Qntan_Logger {
 	/**/
 	void (*trace)( struct Qntan_Logger**, char const*fmt, ...);
 	/**/
+	int (*isFatalOn)( struct Qntan_Logger** );
+	/**/
+	int (*isErrorOn)( struct Qntan_Logger** );
+	/**/
+	int (*isWarnOn)( struct Qntan_Logger** );
+	/**/
+	int (*isInfoOn)( struct Qntan_Logger** );
+	/**/
+	int (*isDebugOn)( struct Qntan_Logger** );
+	/**/
+	int (*isTraceOn)( struct Qntan_Logger** );
+	/**/
 };
 
 
-- 
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